Abstract:
:High demand of neoplastic tissues for glutamine (Gln) is met by its active transport across cell membranes. Chronic treatment with acrylamide in rodents is associated with an increased incidence of neoplasms, including astrocytomas. In this study, 24-h acrylamide treatment significantly increased the initial rate of l-[G-3H]glutamine uptake in astrocyte cultures derived from the acrylamide-sensitive Fischer 344 rat, and this effect could be fully inhibited by histidine, a model substrate for the amino acid transport system N. RT-PCR analysis revealed that acrylamide treatment caused a significant increase in the astrocytic expression of the mRNA coding for the major system N protein, SNAT3, which is specifically overexpressed in malignant gliomas in situ. The acrylamide-induced upregulation of astrocytic Gln transport via system N is likely to affect Gln homeostasis in these cells and may be causally related to the increased astrocytoma incidence observed in Fischer 344 rats.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Wu Q,Sidoryk M,Mutkus L,Zielińska M,Albrecht J,Aschner Mdoi
10.1111/j.1749-6632.2005.tb00052.xsubject
Has Abstractpub_date
2005-08-01 00:00:00pages
435-43eissn
0077-8923issn
1749-6632pii
1053/1/435journal_volume
1053pub_type
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